This name is a synonym of Lactuca perennis L..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 36CA439A-6917-4C52-99C3-2EB54E8F89C4).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Lactuca perennis in version 1 of The Plant List.